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參數(shù)資料
| 型號(hào)： | XC866L-4RR |
| 廠商： | INFINEON TECHNOLOGIES AG |
| 元件分類： | 8位微控制器 |
| 英文描述： | 8-bit Microcontroller with 2/4/8K Bytes In-System Programmable Flash |
| 中文描述： | 8位微控制器與2/4/8K字節(jié)在系統(tǒng)可編程閃存 |
| 文件頁數(shù)： | 65/108頁 |
| 文件大小： | 979K |
| 代理商： | XC866L-4RR |
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XC866
Functional Description
Data Sheet
61
V1.0, 2006-02
3.11
Universal Asynchronous Receiver/Transmitter
The Universal Asynchronous Receiver/Transmitter (UART) provides a full-duplex
asynchronous receiver/transmitter, i.e., it can transmit and receive simultaneously. It is
also receive-buffered, i.e., it can commence reception of a second byte before a
previously received byte has been read from the receive register. However, if the first
byte still has not been read by the time reception of the second byte is complete, one of
the bytes will be lost.
Features:
Full-duplex asynchronous modes
– 8-bit or 9-bit data frames, LSB first
– fixed or variable baud rate
Receive buffered
Multiprocessor communication
Interrupt generation on the completion of a data transmission or reception
The UART can operate in four asynchronous modes as shown in
Table 22
. Data is
transmitted on TXD and received on RXD.
Table 22
There are several ways to generate the baud rate clock for the serial port, depending on
the mode in which it is operating. In mode 0, the baud rate for the transfer is fixed at
f
PCLK
/2. In mode 2, the baud rate is generated internally based on the UART input clock
and can be configured to either f
PCLK
/32 or f
PCLK
/64. The variable baud rate is set by
either the underflow rate on the dedicated baud-rate generator, or by the overflow rate
on Timer 1.
UART Modes
Operating Mode
Mode 0: 8-bit shift register
Mode 1: 8-bit shift UART
Mode 2: 9-bit shift UART
Mode 3: 9-bit shift UART
Baud Rate
f
PCLK
/2
Variable
f
PCLK
/32 or f
PCLK
/64
Variable
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